CinePlex v3 Manual - Plexon Inc

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If the size of the found target object is larger than 1/4 of the frame area, there will
be a red blinking message on the bottom of the screen notifying that the threshold
is probably too low and both the Arm and Record buttons will be disabled.
Try to set the threshold so that the number of parasite objects is as few as possible.
To see all objects, check the “Show All Objects” checkbox.
To see the object recognized as the target object, check the “Show Contour” and
Fill Contour” checkboxes.
88 CinePlex